Governor for air-motors.



M. CLARK.

GOVERNOR FOR AIR MOTORS.

APPLICATION FILED SEPT-13' I51]- 772531 3182 Cdazvk 2 SHEETS-SHEET I.

Patented July 23, 1918.

. gaff/4 M. CLARK.

GOVERNOR FOR AIR MOTORS.

APPLICATION mzo SEPT. 13. 1911.

1 ,27 3,579. Patented July 23, 1918.

2 SHEETS-SHEET 2- iff 4? UNITED srrns PATENT orrron.

MELVILLE CLARK, or CHICAGO, ILLINOIS, ASSIGNOR T0 MELVILLE CLARK rI ANo' COMPA 01? CHICAGO, ILLINOIS, A CORPORATION or ILLINOIS.

GOVERNOR FOR AIR-MOTORS.

Specification of Letters Batent.

Patented July 23, 1918.

Application filed September 13, 1917. Serial N 0. 191,109.

To all whom it may concern:

Be it known that I, MELVILLB CLARK a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented new and useful Improvements inGovernors for Air-Motors, of which the following is a specification, reference being had to the accompanying drawings, forming a part thereof.

The purpose of this invention is to provide an improved means for governing the operation of an air motor particularly when such motor is employed for driving the notesheet-propelling means of an automatic piano player. It consists in the elements and features of construction shown and de scribed as indicated by the claims.

In the drawings: 1

. Figure 1 shows a front elevation of a portion of an air motor equipped with a governor embodying this invention.

Fig. 2 is a section at the line, 22, on Fig. 1. r a

Fig. 3 is a section at the line, 3-3, on Fig. 2.

Fig. 4 is a plan view of a modified form of governor.

' Fig. 5 is a section at the line, 5-5, on Fig. 4.

Fig. 6 is a section at the line, 66, on Fig. 5.

Fig. 7 is a section at the line, 7-7, on Fig. 4.

In the drawings, A is a conventional representation of a portion of an air motor of familiar construction; B is a conventional representation of exhaust devices for operating the motor; C is an air pipe which leads from the exhaust devices to the motor by way of the governing devices hereinafter further described. In the form shown 1n Figs. 1 to 4 inclusive, the air connectlon from the exhaust devices of the motor comprises two chambers, 1 and 2, separated by a valve seat, 3, having a port, 4, the air pipe, C, from the exhaust devices leading through the block, 6, to the chamber, 1, and the air pipe, 0 from the motor, leading to the chamber, 2, through said block, 6. In the chamber, 2, there is mounted for sliding on said valve seat and over said valve port, a slide valve, 7 whose stem extends out through one end of said chamber, and 1s operatively connected outside the chamber ith an earner, e n l s i a bar,

mounted for sliding on the chamber, 1, connected with a tempo lever, 10, which is swung over the graduated tempo scale, 11, for operating the valve. The operating connection between the valve stem and said actuator, comprises the pneumatic, 12, having its fixed member mounted upon the actuator, which is for that purpose bent to extend upward as seen at 8, and the valve stem is connected to the moving wall of said pneumatic as seen at 12". The bar, 8, is bent to extend horizontall over the pneumatic, and then downward and, at its lower end it is connected by a spring, 15, with the moving wall of the pneumatic, the spring being stretched by the collapse of the pneumaticand reacting to hold the pneumatic normally expanded.

The pneumatic is connected by a tube, 16,

with the exhaust devices, so that the exhaust tension produced in the exhaust devices and operating for other-purposes in the automatic player, is experienced in said pneumatic with a tendency to collapse it against the resistance of the spring, 15.

With the construction shown and with variable exhaust tension it will be seen that in whatever position the operator may set the tempo valve, 7, for regulating the speed of playing, the valve and expansion of the pneumatic, 12, according to the degree of exhaust tension produced in the exhaust devices; with the desired result, namely, that whereas a higher exhaust tension in the exhaust devices with a given adjustment of the tempo valve would. yield a more rapid rate of action of motor and more rapid playing, thus defeating the accuracy of the control of speed by means of the tempo lever, the action of the pneumatic, collapsed more or less according to the degree of exhaust tension, operates to close the valve, 4, as the exhaust tension is increased, and to open it as the tension is lowered, thus preventing the change of speed which would otherwise result from the change of exhaust tension with a given adjustment of the tempo lever.

In the form shown in Figs. 5 to 7 inclusive the same result is obtained by means differing in this, that instead of having the tempo valve mounted for movement with respect to the actuator which is moved by the tempo lever, the valve seat is made movable With respect to the valve, and said valve eat is m v d y the Pn u tic leased of the valve being moved with respect to the actuator as in the preceding figures. In said Figs. 5'to 7""inclusive; the parts identi= cal, substantiallyjwvith the p'recedingfigures,

are similarly indicated; the valve seat, however, consisting of a part, 3*, which is mounted movably With respect-to the part tion, 3

which extends out from the end of the chamber and is connected at 12 to the moving Wall, of the pneumatic, 12V; and the spring,

15-, connected With the. pneumaticfor h0ld. ingit normally expanded is attached to a:

bracket, 18, fixed WitllaI'GSPG/Ct to theentire casing; which comprises the chambers, 1.

and 2. "I 'claim:'. n i g 1. Argovernor foran exhaust-operated air motor'comprisinga tempo valvewhich conthe port; tempo-controlling means for actu-v ating one of said. parts, valve and seat,a pneumatlc and duct connection. therefrom to the exhaust devicesindependent of-theexhaustdevice connection with the motor, the q 30 movable Wall of the pneumatic being, operatively connected "with one of said tWoj-rela- -claim 1,'the pneumatic-actuated one of said 'tWo nl'elatlvely movable parts being the valve seat.

3..In a construction such as setwout in claim 1, one of said two relatively movable parts being connectedfor actuation bythe;

tempo-controlling means, an'dtheother being connected for actuation by said pneu: matlc. V

L- Agovernor for an exhaustbperatedair motor comprising a duct or passage foricone necting thev exhaust. devices With the motor.

and vtWo means. for. controlling v the; flow" of air through said" duct connections; atpneu matic having independent gconnection With the exhaust devlces mechanlcali connections from the pneumatic for operating one of sald controlling-means, and m'echamcal, con- 7 nections independent of said pneumatic for operating the other of, said controlling means.

In testimonywhereof; I ihavezhereunto set my hand at Chicago Illi i 7th dayvof September, 1917. I 3 g V t MELviL E CLARK,

00 m ,efithiss patent maybe obtained ,for five cents each, by addressing the Commissioner of ratentfli" Washingt0n, l9.0. 7 7 

